Photo by: Evan Agostini
** FILE ** Sir Elton John (left) and husband David Furnish attend the ninth annual Elton John AIDS Foundation benefit "An Enduring Vision" at Cipriani Wall Street in New York in October 2010. Mr. John and Mr. Furnish have become parents to a 7-pound, 15-ounce baby boy born on Christmas Day. (AP Photo/Evan Agostini, File)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.